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git_commit commit e739ce2e10e60a2f3363b1ba26c388c7d7aa7bd4
Author: A. Jiang <de34@live.cn>
Date: Wed Mar 5 08:31:28 2025 +0800

[libc++] Add missed `constexpr` to `erase(_if)` in `<string>` (#129666)

`std::erase(_if)` for `basic_string` were made `constexpr` in C++20 by
cplusplus/draft@2c1ab9775cc53e848a1efff4f9976455538994d4 as follow-up
changes of P0980R1.

This patch implements the missed changes that were not tracked in a
specific paper.
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ldionne-old-macbook-results test results

Run Order Start Time Duration
Current 529401 2025-12-16T16:40:01 0:00:00
Previous 529394 2025-12-16T16:40:01 0:00:00
Baseline 485288 2025-12-16T16:40:01 0:00:00


Tests Summary

Status Group # # (B)
Performance Regressions 4 0
Performance Improvements 3 0
Added Tests 0 18
Unchanged Tests 83 72
Total Tests 90

Performance Regressions - execution_time Δ Previous Current σ Δ (B) σ (B)
736_ocio_r 2.64% 16.139 16.564 - 0.00% -
735_gem5_r 2.59% 13.708 14.063 - 0.00% -
729_abc_r 1.82% 18.651 18.991 - 0.00% -
753_ns3_r 1.13% 10.705 10.826 - 0.00% -

Performance Improvements - execution_time Δ Previous Current σ Δ (B) σ (B)
727_cppcheck_r -3.10% 25.266 24.483 - 0.00% -
710_omnetpp_r -1.63% 8.604 8.464 - 0.00% -
767_nest_r -1.12% 14.314 14.154 - 0.00% -

Added Tests - execution_time
706_stockfish_r
707_ntest_r
709_cactus_r
710_omnetpp_r
721_gcc_r
723_llvm_r
727_cppcheck_r
729_abc_r
731_astcenc_r
734_vpr_r
735_gem5_r
736_ocio_r
737_gmsh_r
748_flightdm_r
750_sealcrypto_r
753_ns3_r
766_femflow_r
767_nest_r


Report Time: 0.10s
Name Current %
706_stockfish_r 22.083 -
707_ntest_r 17.808 -
709_cactus_r 19.773 -
710_omnetpp_r 8.464 -1.63%
721_gcc_r 12.969 -
723_llvm_r 11.412 -
727_cppcheck_r 24.483 -3.10%
729_abc_r 18.991 1.82%
731_astcenc_r 10.012 -
734_vpr_r 15.382 -
735_gem5_r 14.063 2.59%
736_ocio_r 16.564 2.64%
737_gmsh_r 13.127 -
748_flightdm_r 8.936 -
750_sealcrypto_r 18.328 -
753_ns3_r 10.826 1.13%
766_femflow_r 12.786 -
767_nest_r 14.154 -1.12%
Geometric Mean 14.372 -